Acclimation of Polygonum minus Huds. to Low Light Irradiance and Its Effects on Growth, Leaf Gas Exchange and Antioxidant Defense
Document Type
Article
Publication Date
9-1-2024
Abstract
Polygonum minus Huds. has massive potential to be commercialized following many current discoveries of its medicinal properties. We investigated the growth and physiology changes of P. minus under different shading and treatment durations. The effects of four shading levels: 0% (T1), 30% (T2), 50% (T3) and 70% (T4) and two treatment durations of 10 weeks and 20 weeks were studied. Significant effects of shading levels and treatment durations were observed on the transpiration rate (E), leaf resistance, pigment content in leaves (Chl a, Chl b and Car), carbohydrate, ascorbic acid, total anthocyanin, phenolic and flavonoid contents. Enzyme activity of superoxide dismutase and ascorbate peroxidase were also significantly affected by shading levels and treatment durations. The highest antioxidant activities were recorded under T4 of both treatment durations along with the high content of Chl a, Chl b and Car. The leaf, stem and root extracts of P. minus were also subjected to HPLC analysis for quantification of selected flavonoid compounds. It was observed that longer treatment duration of 20 weeks reduced the amount of flavonoid.
Keywords
Polygonum minus Huds, Shading levels, Treatment duration, Growth, Leaf gas exchange, Antioxidant activities
Divisions
InstituteofBiologicalSciences,cebar,ocean
Funders
Long Term Research Grant Scheme (LRGS) (LR003-2020),Research University Grant (GPF009B-2018)
Publication Title
Journal of Plant Growth Regulation
Volume
43
Issue
9, SI
Publisher
Springer
Publisher Location
ONE NEW YORK PLAZA, SUITE 4600, NEW YORK, NY, UNITED STATES